Pencil



Feb. 14, 1928.

. J. P. LYNN.

PENCIL Filed Aug. 4. 1926 Patented Feb. 14, 1928.

UNITED STATES 1,659,533 PATENT OFFICE..

JOHN P. LYNN, OF CHICAGO, ILLINOIS, ASSIGNOB '.lO DUR-O-LITE PENCIL COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.`

PENCIL.

Application led August 4, 1926. Serial No. 126,976.

This invention relates ,to a pencil having a hollow body through which a lead may be fed into position, for writing, and more particularly to certain means for advancing the lead, as desired.l It is directed also to an improved process of forming one of the ropelling components of the pencil, an to greater simplicity in its construction and operation.

In the accompanying drawings is shown an exemplification of my invention in the manner following:

Figure 1 is a longitudinal section taken centrally through the pencil;

Figs. 2 and 3 are enlarged transverse sections therethrough taken, respectively, on lines 2-f2 and 3-3 of Fig. 1;

Fig. 4 isan enlargedfragmentary detail insection of the upper end of the pencil tip` and associated parts; A y Figs. 5, 6,7 and 8 are longitudinal sections showing four stages in the development of the tip by a die-formin process;

Fig. 9 is a lon itu inal section throu h the lower pencil en showing a tip of slight y modified construction;

Fig. 10 is a fragmentary detail in eleva. tion of the tip appearing in Fig. 9 and Fig. 11 is a fragmentary detail 1n section, similar to Fig. 4, showing a modification in the neck of the tip.` ,v

The present pencil may comprise albody A having at one end a rotatable tip B and at the opposite end a ferrule C wherein 1s retained an eraser by any suitable means. In the upper portion of the pencil body is a: chamber 11 forming a magazine for reserve leads and closed at its bottom as y a partition 12. Extending below this partition 1s an elliptical chamber having, by preference, a Vtubular lining 14 fitted closely against the walls thereof. Thislatter chamber terminates adjacent a flaring shoulder 15 below which' is a circular bore 16 extending to the bottom end of the pencil. Within thislower bore ispreferably fitted a circular lining 1.7 which terminatesflush with the lower pencil end. It may also be desirable to provide, as. shown, an annular recess adjacent the lower pencil end upon the outer side thereof.-

A pencil body so constructed is ada ted to co-operate with a tip B which,in the orm y shown, comprises avconical-wall 18 straightened as at 19 for a ortion-of its length, and then doubly reverse y bent in an inward d1- are omitted, an inclined shoulder 26 being substituted therefor'. Such a shoulder is adapted to seat against the lower end of a pencil which is inwardly beveled as at 27, after the manner illustrated in Fig. 9.

With a tip of the character fescribed lI associate'a tube 28 which is exten ed axially withinthetip for the greater portion of its length. The lower end of the tube is rested against the tapering walls of the tip, and its upper end, by preference, is outwardly flared as at 29 to rest againstthe neck 22 at the juncture of the inward bend 23. The tube s thus secured within the tip with' sufficient firmness for all needful purposes. A modification of this construction appears in Fig. 11 wherein the upper tube end is offset outwardly at 29a to bear against the neck walls which are bent over'and downwardly to form a threaded throat 24a which lies inwardly of the offset'tube end. If desired, a split ring onwasher 30 may be positioned between the tube and neck near the lower end of the latter, whereby to lend additional support to the former. In lieu of the tube just described, it is possiblewith equal advanta e to make use of a spiral 31 which exten s axiall' place under slightendwise compression, a firm and steady mounting within the tip isv assured.

The tube 28 (or spiral 31) serves as a guide for a lead D which is adapted to be fed through the lower extremity of the tip. Its travel is effected by means of a threaded propeller 32 having a .flattened head 33 adapted to slide freely within the elliptical lining 14 wherein it is incapable of turning. The threads of this propeller extend from below a smooth portion 34 adjacent its head throughout most lof its length, and co-op erate with the threads 25 in the throat 24 D0 within the tip.- If the spiral be y of the tip. The lower end of the propeller cally. Its body is preferably formed of some material which can be moulded and pressed to the desired shape around the linings A14 .and 16 which are thereby permanently -anchored in place. A similar lining 36 may also be provided for the chamberv 11 as shown. The remaining parts ofthe pencil,

, tice, so as to produce spring sections which frictionally engage the lead. The upper end of the tube is then subjected to the action of dies which produce the reverse bends 20 and 21,`and reduce the upper end to form the ,neck 22, as shown in Fig. 7. Before finishing the tip, the tube 28 (or spiral- '31) is dropped in place,falso the ring 30, which is'preferably slit, so as to stay in place by its own spring action. The nal operation of forming the throat 24 is thenl proceeded with. By these successive steps a tip answering to the preceding description may be produced expeditiously and economically.

The operation of the pencil, should be readily understood. The neck of the tip is fitted within the lining 16 and because of the resulting metal to metal contactI obtain a frictional connection which permits the tip to rotate smoothly relative to the body of the pencil. In Fig. 3 I have suggested a cross sectional form of the neck which provides a plurality of spring sections 42 for engaging the lining 16. These may be formed conveniently by pressing inwardly the intervening neck portions 43, as shown, whereby to produce a plurality `of bulging surfaces. The upper tip edge formed by the reverse,v bend 20 provides in effect a collar adaptedl to t into the annular recess surrounding the lower body end, whereby to form therewith a neat connection. To ,the inside of this recess the body wall is relatively thin but on account of the reinforcement derived from the .lining 16 itis adequately strong for all purposes. This manner of uniting the tip to the lower end of the pencil makes for avery eiiicient and serviceable construction, such that the one part reinforces the other. In the construction shown in Fig. 9, the inwardly beveled surface 27 cti-operates with the inclined shoulder 26 in such a inanner that a centering action takes place irrespectlve of the `fit of the neck22within the lining 16.

By rotatingv the tip relative to the body, the propeller which cannot turn wlthin the latter, is movedl lengthwise due to the feeding action of the screw threads 25 upon the threads of the propeller. This move` ment will continue until the threaded sur- Y face of the propeller has traveled past the throat 24. At this point (sce Fig. 9) the threads 25 (preferably rolled so as to project into the throat 24) when engaged with the smooth Surface 34 cannot further advance the propeller, even though rotation of the tip continuesrelative to the body. By this means I eliminate the possibility of binding or jamming'- ofthe parts when the propeller has reached the limit of its travel.`

Referring again to Fig. 9, it will be noted that the lower tapered end of the propeller 'is projected into the opening at the lower tip end. On account of the 1tapered'walls which are presented to cach other, the propeller has la tendency to reverse its movement whenever permitted so to do. I take advantage of this so asv to effect a re-engagement of. the threads 25v with those on y the propeller without having to apply thereto any extraneous pressure., v

' I claim: l

' 1. A pencil having a body, a tapered tip member fitted rotatablyto the llower end of the body, a guide tube extended'longitudinally within the tip member, said tip member being swagedvv inwardly adjacent its upper end and internally threadedI to provide a threaded throat confining .the upper end of the guide tube the lower end of which is rested against the tapered tip walls, and a screw propeller coacting with the threads in the throat and having a head which is fitted 'slidably but non-rotatably within the p l body, substantially as described. j

2. A pencil-having a body with an external annular recess at its lower end, a tip membery formed in its. lower region 'with l.tapering walls which straighten up to provide a collar which surrounds the recess extending-around the body, the tip member being further formed with a double reverse bend -immediately adjacent the collar whereby to provide a'neckof reduced diameter adapted to extend within the body for an appreciable distance, a lead guide tube enclosed within the tip member and su ported thereby at its opposite ends, a t readed. throat swaged over said tube at the upper end of the. neck providing ai bar against removal of the tube, a threaded propeller adapted to coact with the throat to' advance within the tip member, and means within-the pencilbody co-acting with the propeller to rotatably therethrough, substantially as 'described.

3. A pencil comprisingin combination a lli) lat L body, meanstherein providing a. non-cip..

cular axialopening, n removable tip member havin a circular resilient portion adapted: for frictional rotatable connection with the.

vmember being t neuw I' lower end of the body, a lead guide tube l mounted within the tip member, -the tip swagedinwardly at a point beyond one end of said'tube and internally threaded, and a propeller adapted for travel through the tube and ha threads which engage with those on the t1 member, the propeller being provided wi a head which cooperates with the non-circular portion of the axial opening, substantiallyas described,

4. A pencil having a body with a -no'ncircular axial opening, a tip member detachably connected to the body for rotation relative therewith, a propeller'movable lo i tudinally throughthe body opening into t e tip member, there being means for preventing rotation of the propeller relative to the body, and inte-rengaging screw' threads on the tip member and propeller terminating on the latter short of its upper end whereby to'advance the propeller throughv a limited distance only in res nse to continued rotation of the tip mem er relative to the body,

substantially as described. A 5. A pencil having a body to which is fitted a rotatable tapered ti member havin internal threads, a` prope er having bot smooth and threaded surfaces, the latter coacting with the tip member, and means by which rotation of the propeller relative to `the body is prevented, the propeller being movable through the tip member in response .to rotation thereof relative to the body, the

to rotation thereof' relative to the body, the 4 smooth portion of the propeller surface re ceiving engagement from the tip member threads at one int in its movement where- -by further a vance of the propeller is i checked, and the propeller end being tapered rotatably connected to receive pressure fromv the tapered walls of the tip member when the ropeller movement is' arrested whereby te propeller is u d reversely preliminary to a reverse rotatlon of thetp member relative to the body, slipstant'iallydaeildeseribedimd to mail .A 'c' avinga y `w' is Pen a tapered tip member one end of which isinternally threaded, a propeller threaded to co-aet with the ti member except in the region of its two en s the forward of which is ta pressure from`the tip Ainem r walls when advanced. to tlle Lof ithmovementl, the o posite prope er en insu position ying a jacent the tip member threads whereby red to receive` further 'co-action therewith is arrested, and

means for preventing rotation of the propeller relative to the body while permitting :tree sliding movement longitudinally thereof, substantially as described.

8. A'pencil having a body to which is ro tatably connected a tip member having taperedY walls at its -lower end, atube axially mounted' within the tip' member having its upper end outwardly flared and its lower;

end bearing against the tapered walls of the tip member, teu per end of the tip member being reduce to form a neck which surrounds the tube in spaced relation except at its ilared upper end, the upper end of t neck being swaged inwardly and threaded to provide a threaded throat at the extremity ofthe neck providing meansA for retaining the tube within the f tip member, and a threaded propeller co-acting `with the threaded throat havin meansror resisting' rotation relative to e body when the tip member is rotated relative thereto, substantially as described. u

u 9. A pencil having -a body to which is rotatably connected a removable tip member wherein is mounted anaxial tube supported therein at its vupper and lower ends, the-ti member bein extended upwardly beyon the tube at w ch pont'the tip member is swaged inwardly and `rovided with internal threads, and a threaded proller coacting with the tip member and sli bly mounted the body but 'non-rotatable therein and adapted for travel through the axial tube in response to rotation of the tip, member relative to the body, substantially as described. Y v Y 10. A pencil having 'a body to which is rotatably connected atip member wherein is mounted a lead gui `means supported at its upper' land lower en the ti member beingl extended upwardly beyon the tube at w 'ch point the tip ,member is swa wardly and providedwith internal a threaded propeller with the tip member sli ably mounted' wlthinthe body but non-rotatable'therein` and adapted for travel through the' axial tube in response to rotation of the tip member relative to the body, substantially as described. l

yJOHN P. LYNN.

reads,r 

